|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
/** |
|
4
|
|
|
* Linna Cross-site Request Forgery Guard |
|
5
|
|
|
* |
|
6
|
|
|
* @author Sebastian Rapetti <[email protected]> |
|
7
|
|
|
* @copyright (c) 2020, Sebastian Rapetti |
|
8
|
|
|
* @license http://opensource.org/licenses/MIT MIT License |
|
9
|
|
|
*/ |
|
10
|
|
|
declare(strict_types=1); |
|
11
|
|
|
|
|
12
|
|
|
namespace Linna\CsrfGuard\Provider; |
|
13
|
|
|
|
|
14
|
|
|
use Linna\CsrfGuard\Exception\BadExpireException; |
|
15
|
|
|
use Linna\CsrfGuard\Exception\BadStorageSizeException; |
|
16
|
|
|
use Linna\CsrfGuard\Exception\BadTokenLenghtException; |
|
17
|
|
|
|
|
18
|
|
|
/** |
|
19
|
|
|
* Syncronizer token provider |
|
20
|
|
|
*/ |
|
21
|
|
|
class SynchronizerTokenProvider implements TokenProviderInterface |
|
22
|
|
|
{ |
|
23
|
|
|
/** |
|
24
|
|
|
* @var string CSRF_TOKEN_STORAGE Token storage key name in session array |
|
25
|
|
|
*/ |
|
26
|
|
|
private const CSRF_TOKEN_STORAGE = 'csrf_syncronizer_token'; |
|
27
|
|
|
|
|
28
|
|
|
/** |
|
29
|
|
|
* @var string $sessionId Session id of the current session |
|
30
|
|
|
*/ |
|
31
|
|
|
private string $sessionId = ''; |
|
32
|
|
|
|
|
33
|
|
|
/** |
|
34
|
|
|
* @var $expire Token validity in seconds, default 600 -> 10 minutes |
|
|
|
|
|
|
35
|
|
|
*/ |
|
36
|
|
|
private int $expire = 0; |
|
37
|
|
|
|
|
38
|
|
|
/** |
|
39
|
|
|
* @var $tokenLenght Token lenght in chars |
|
|
|
|
|
|
40
|
|
|
*/ |
|
41
|
|
|
private int $tokenLenght = 32; |
|
42
|
|
|
|
|
43
|
|
|
/** |
|
44
|
|
|
* @var $storageSize Maximum token nonces stored in session |
|
|
|
|
|
|
45
|
|
|
*/ |
|
46
|
|
|
private int $storageSize = 10; |
|
47
|
|
|
|
|
48
|
|
|
/** |
|
49
|
|
|
* Class constructor. |
|
50
|
|
|
* |
|
51
|
|
|
* @param string $sessionId Session id of the current session |
|
52
|
|
|
* @param int $expire Token validity in seconds, default 600 -> 10 minutes |
|
53
|
|
|
* @param int $storageSize Maximum token nonces stored in session |
|
54
|
|
|
* @param int $tokenLenght Token lenght in bytes |
|
55
|
|
|
* |
|
56
|
|
|
* @throws BadExpireException If $expire is less than 0 and greater than 86400 |
|
57
|
|
|
* @throws BadStorageSizeException If $storageSize is less than 2 and greater than 64 |
|
58
|
|
|
* @throws BadTokenLenghtException If $tokenLenght is less than 16 and greater than 128 |
|
59
|
|
|
*/ |
|
60
|
1 |
|
public function __construct(string $sessionId, int $expire = 600, int $storageSize = 10, int $tokenLenght = 32) |
|
61
|
|
|
{ |
|
62
|
|
|
// expire maximum tim is one day |
|
63
|
1 |
|
if ($expire < 0 || $expire > 86400) { |
|
64
|
|
|
throw new BadExpireException('Expire time must be between 0 and PHP_INT_MAX'); |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
1 |
|
if ($storageSize < 2 || $storageSize > 128) { |
|
68
|
|
|
throw new BadStorageSizeException('Storage size must be between 2 and 128'); |
|
69
|
|
|
} |
|
70
|
|
|
|
|
71
|
1 |
|
if ($tokenLenght < 16 || $tokenLenght > 128) { |
|
72
|
|
|
throw new BadTokenLenghtException('Token lenght must be between 16 and 128'); |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
1 |
|
$this->sessionId = $sessionId; |
|
76
|
1 |
|
$this->expire = $expire; |
|
77
|
1 |
|
$this->tokenLenght = $tokenLenght; |
|
78
|
1 |
|
$this->storageSize = $storageSize; |
|
79
|
|
|
|
|
80
|
|
|
//if no nonce stored, initialize the session storage |
|
81
|
1 |
|
$_SESSION[static::CSRF_TOKEN_STORAGE] ??= []; |
|
82
|
1 |
|
} |
|
83
|
|
|
|
|
84
|
|
|
/** |
|
85
|
|
|
* Return new Synchronizer based Token. |
|
86
|
|
|
* |
|
87
|
|
|
* @return string A hex token |
|
88
|
|
|
*/ |
|
89
|
|
|
public function getToken(): string |
|
90
|
|
|
{ |
|
91
|
|
|
//generate new nonce |
|
92
|
|
|
$token = \bin2hex(\random_bytes($this->tokenLenght)); |
|
93
|
|
|
$time = \base_convert((string) \time(), 10, 16); |
|
94
|
|
|
|
|
95
|
|
|
//store new nonce |
|
96
|
|
|
$_SESSION[static::CSRF_TOKEN_STORAGE][] = $token.$time; |
|
97
|
|
|
|
|
98
|
|
|
//check if the storage is growt beyond the maximun size |
|
99
|
|
|
if (\count($_SESSION[static::CSRF_TOKEN_STORAGE]) > $this->storageSize) { |
|
100
|
|
|
//remove the oldest stores nonce |
|
101
|
|
|
\array_shift($_SESSION[static::CSRF_TOKEN_STORAGE]); |
|
102
|
|
|
} |
|
103
|
|
|
|
|
104
|
|
|
return $token; |
|
105
|
|
|
} |
|
106
|
|
|
|
|
107
|
|
|
/** |
|
108
|
|
|
* Validate Synchronizer based Token. |
|
109
|
|
|
* |
|
110
|
|
|
* @param string $token Token must be validated, hex format |
|
111
|
|
|
* |
|
112
|
|
|
* @return bool |
|
113
|
|
|
*/ |
|
114
|
|
|
public function validate(string $token): bool |
|
115
|
|
|
{ |
|
116
|
|
|
//reference to token storage in session |
|
117
|
|
|
$tokens = &$_SESSION[static::CSRF_TOKEN_STORAGE]; |
|
118
|
|
|
//get current size of token storage in session |
|
119
|
|
|
$size = \count($tokens); |
|
120
|
|
|
//bytes to b16 chars |
|
121
|
|
|
$chars = $this->tokenLenght * 2; |
|
122
|
|
|
//current time |
|
123
|
|
|
$time = \time(); |
|
124
|
|
|
|
|
125
|
|
|
for ($i = $size -1; $i > -1; $i--) { |
|
126
|
|
|
//get token from storage |
|
127
|
|
|
//if token in storage doesn't match user token continue |
|
128
|
|
|
if (($tmpToken = \substr($tokens[$i], 0, $chars)) !== $token) { |
|
|
|
|
|
|
129
|
|
|
continue; |
|
130
|
|
|
} |
|
131
|
|
|
|
|
132
|
|
|
//get time from storage |
|
133
|
|
|
$tmpTime = \substr($tokens[$i], $chars); |
|
134
|
|
|
//timestamp from token time |
|
135
|
|
|
$timestamp = (int) \base_convert($tmpTime, 16, 10); |
|
136
|
|
|
|
|
137
|
|
|
//token expiration check |
|
138
|
|
|
if (($timestamp + $this->expire) > $time) { |
|
139
|
|
|
return true; |
|
140
|
|
|
} |
|
141
|
|
|
} |
|
142
|
|
|
|
|
143
|
|
|
return false; |
|
144
|
|
|
} |
|
145
|
|
|
} |
|
146
|
|
|
|
linna /
csrf-guard
Loading history...